A report has found that construction works at the DART bridge in Dublin's Ballsbridge last October did not cause the widespread flooding which occurred in the area.
Local residents and their insurance representatives had claimed that scaffolding in the Dodder river had caused an accumulation of debris producing a dam effect and leading to widespread local flooding.
But a report commissioned by Iarnród Éireann found that the blockage caused the water to erode the river bed and actually increased the water flow of the river under the bridge.
This slightly reduced the amount of flooding in the surrounding area.
The investigation was led by hydrology expert Professor Eamon McKeogh, who also led the investigation in the collapse of the Malahide viaduct.
Local Labour TD Kevin Humphries maintained today that the rail company still bears part of the responsibility for the flooding.
He said that the scour to the river bed occurred after the debris had caused flooding upstream.
Nearly 300 properties were damaged in Ballsbridge when the river Dodder burst its banks.
An estimated 260 cars were written off when they were submerged in an apartment complex while the Marian swimming pool was flooded and has been closed since. It is due to re-open soon.
In a statement, Iarnród Éireann said the report had independently confirmed that scaffolding on the bridge was not a factor in the flooding in the area.
It said the company is making the report available publically to allow residents, local representatives and other interested parties to study the findings in detail.